EPS 900 Ashwood Parkway Suite 350 Atlanta, Georgia 30338

(404) 315-9113 Telephone (404) 315-8509 Fax

January 18, 20)i' :£ VIA EMAIL AND REGULAR MAIL

Mr. Gala Jackson Remedial Project Manager US EPA Region 4 61 Forsyth St S.W. Atlanta, Georgia 30303-8960

Kirk J. Kessler, P.G. Principal

(678) 336-8544 Direct Line kkessler@envplanning.com

Re: Screening of Constituents with Limited Detections and Detection Limits Exceeding the EPA Regional Screening Level Table Operable Unit #3 (OU3), LCP Chemicals Site, Brunswick, Georgia

Dear Mr. Jackson:

The purpose of this correspondence is to provide you with the information regarding the above-referenced subject that you requested during our meeting on December a. 2010, which was held at the U.S. Environmental Protection Agency's ("EPA") offices, and during our follow-up webinar held on December 22, 201 0.

The previous discussions between Honeywell and EPA regarding this topic focused on whether to carry forward in the Human Health Baseline Risk Assessment ("HHBRA") for OU3 as Constituents of Potential Concern ("COPCj chemicals that have not been detected in site soils or that have a low frequency of detection but have detection limits ("DLs") that often exceed the EPA's residential Regional Screening Levels ("RSLs")1 for soil. The EPA suggested using a methodology of comparing the DLs for these chemicals with the EPA's Contract Required Quantitation Limits ("CRQLs") and RSLs. On December 2, 2010, EPA provided Honeywell with a table illustrating the proposed methodology applied to the Quadrant 4 data set.2 Exhibits 1-6, which are attached to this letter, present the implementation of your proposed methodology to the full datasets used for the individual Exposure Units ("EUs'1 (comprised of the Offsite Tank Farm ("OTF") and Quadrants 1 through 4). For sake of completeness, we have also applied your proposed methodology to the site-wide data set (i.e., the pooled data for all EUs).

The specific criteria for the EPA's requested methodology includes the elimination of ~emich's with fewer than: ft$ 0 vt ,.~ 1 O~f detection limits ~w the CRQl (red font text In Exhibits 1-6); [,/

1 These are the constituents identified with a "B" footnote in Exhibits A1-A5 of Honeywell's April 21, 2010 OU3 response to comment letter. · 2 An updated Quad 4 table was provided on December 21, 2010.

p I ,_rJl .

Mr. Galo Jackson 1 %' · January 18, 2010 v~c- \ 9 Page 2t~ tf vt · J~s5f . _ .l p.(,O

• 5% of _9f¥Bction limits ~titt6w the RSL 3 (blue font text in Exhibits 1-6); and

I\ 1 0 rn~lyse:!>in the site-wide data set (yellow shaded rows in Exhibits 1-6).

The chemicals remaining after the application of the criteria listed above are shown in black

font text in Exhibits 1-6 and are summarized in the following table:

EU Based Parameters

"' Tetrachloroethane Thallium

Exposure Unit Site-Wide Based

Parameters

1,2,3-Trichloropropane

2,4-Dinitrophenol 2,4-Dinitrotoluene 2,6-Dinitrotoluene ·3,3'-Dichlorobenzidine 4-Chloroaniline 4,6-Dinitro-2-methylphenol

Aroclor-1 016 Aroclor-1221 Aroclor-1232 Aroclor-1242 Aroclor-1248 Aroclor-1254 Aroclor-1260

Aroclor-1268 Benzo(blk)fluoranthene bis(2-Chloroethyl) ether

Cobalt Dieldrin Hexachlorobenzene Hexachlorobutadiene

Nitrobenzene N-Nitroso-di-n-propylamine Pentachlorophenol

, Toxaphene Toxaphene

,X Vin I chloride

' I

3 The ASLs for non-carcinogens wete adjusted to a hazard quotient of 0. 1.

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. - ~ ·· ""' j· .· .. ') '- . • --r, ' ·~ '.) -::: ~ ) . "

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Mr. Galo Jackson January 18, 2010 Page 3 of 5

The analysis illustrates that significantly fewer chemicals carry forward as COPC when the criteria are applied on a site-wide basis. This is because when the data set is segregated into smaller EU-specific data sets, a small number of DLs exceeding either the CRQLs or RSLs can disproportionately affect the exceedence percentages. In addition, the vast majority of detection limit exceedences of RSLs and CRQLs are those associated with the QAL on-site laboratory utilized during the Time Critical Removal Action.

It is our understanding that EPD perhaps desires the condition that all of the constituents eliminated as COPC based on this methodology would still be discussed qualitatively in the uncertainty section of the HHBRA. In addition, EPA's proposal also suggests that additional site characterization might be performed for the "black font" chemicals during a later stage in the remedial action process (e.g., remedial design). However as we discussed during our meeting on December 8, 2010, any method of examining data on a frequency-of­exceedence basis for this Site is strongly biased to the large percentage of on-site laboratory data records to the overall data set. Additional site characterization performed at a later stage in the remedial action process will not substantially change the percentages.

Because of this bias, EPA askC.d Honeywell to further examine the Level IV data portion of the overall data set for the "b19fik font" parameters with respect to comparison of detections and DL values to the respective RSL values. When the dataset is evaluated in this manner, there is still a significant amount of Level IV data collected from all areas of the Site for all of the parameters of interest herein. We have illustrated this using a GIS-based analysis that shows that for most of these parameters the Level IV data DLs are not of issue (i.e., DLs below CRQLs and RSLs). The figures associated with this analysis are provided as Exhibit 7.4

This GIS-based analysis demonstrates that all of the parameters evaluated herein have been adequately characterized and do not warrant being considered as COPC, given that there are very few detects and where detected the values are below RSLs. The parameters with more significant DLs issues are as follows:

• 2.4-dinitrotoluene - no samples with detections; 154 of 154 DLs (1 00%) exceed the adjusted RSL while 31 of 154 DLs (20%) exceed the actual RSL value.

• 3.3'-dichlorobenzidine - no samples with detections; 33 of 154 (21 %) DLs exceed the RSL.

• 4.6-dinitro-2-methylphenol - of two detections, only one is above the RSL; 144 of 146 (99%) of DLs exceed the RSL. However, only 28/146 (19%) DLs exceed the CRQL on a site-wide basis. All of the samples with DLs that exceed the CQRL were analyzed by EPA's Environmental Sciences Division ("ESD") laboratory.

• bis(2-chloroethyllether - no samples with detections; 153 of 154 (99%) DLs exceed the RSL. However, only 25/154 (16%) DLs exceed the CRQL on a site-wide basis. All of the samples with DLs that exceed the CQRL were analyzed by the ESD laboratory.

v 4 The figures in Exhibit 7 are not individually numbered, but they do include all of the "bl~k fonr parameters in the table above and in Exhibits 1-6. There are two figures associated with each chemical; the first shows actual detections (no locations are depicted where all results are non-detect) and the second shows the non-detect DL values. In both cases the values are grouped into concentration range classes with "break points" corresponding to the residential RSL values.

Mr. Gala Jackson January 18, 2010 Page 4 of 5

• hexachlorobenzene - three detections all below the RSL value; 151 of 154 (98%) DLs exceed the RSL. However, only 25/154 (16%) DLs exceed the CRQL on a site­wide basis. All of the samples with DLs that exceed the CQRL were analyzed by the ESD laboratory.

• n-nitroso-di-n-propylamine - no samples with detections; 154 of 154 (1 00%) DLs exceed the RSL. However, only 25/154 (16%) DLs exceed the CRQL on a site-wide basis. All of the samples with DLs that exceed the CQRL were analyzed by the ESD laboratory.

• pentachlorophenol - no samples with detections; 128 of 154 (83%) DLs exceed the RSL. However, only 30/154 (19%) DLs exceed the CRQL on a site-wide basis. All of the samples with DLs that exceed the CQRL were analyzed by the ESD laboratory.

• thallium - 31 samples with detections site-wide, all below the adjusted RSL; 92 of 122 DLs (75%) exceed the adjusted RSL; 16 of 122 (13%) DLs exceed the RSL.

The data for the polychlorinated biphenyls (PCB), as represented by the Aroclor-specific analyses, warrants further discussion in the context of this analysis. For most of the EUs, Aroclors 1254, 1260, and 1268 are identified as COPC based on maximum detected concentrations that exceed the residential RSLs. As shown in the Attachment 7 figures for these Aroclors, there are multiple detections in the Level IV laboratory data, many of which are above the residential RSL value of 0.22 mg/kg used for COPC screening. Indeed, these three Aroclors are known to have been used at the Site and, thus, is appropriate that they are indentified as COPC.

All of the other Aroclors, however, have very few detections and only one of these detections (for Aroclor 1221) exceeds the residential RSL within the entire Level IV data set. Further, the Level IV datasets for all of the Aroclors demonstrate robust spatial coverage of the Site and furthermore, the vast majority of detection limits that are below the residential RSLs. Given the fact that each Aroclor represents a mixture of individual PCB congeners, and that differential environmental ''weathering" of these congeners over time can make it more difficult to identify the specific Aroclor present in a sample,5 it is not surprising that there might be a few detections reported by the laboratory for Aroclors not associated with the Site. A stark contrast in number of detections is evident when comparing the figures for the three site-related Aroclors (1254, 1260, and 1268) to all other Aroclors. Therefore, COPC status is justified only for the three site-related Aroclors- 1254, 1260, and 1268.

Finally, EPA's ESD laboratory did not differentiate between benzo(b)- and benzo(k)­fluoranthene. There is no RSL value for benzo(b/k)fluoranthene. Honeywell proposes that the results reported by the ESD laboratory for benzo(b/k)fluoranthene be grouped with the analytical data for benzo(b)fluoranthene for calculating exposure point concentrations. This is a conservative manner of handling these data as the RSL value for benzo(b)fluoranthene is lower than the value for benzo(k)fluoranthene by one order of magnitude.

5 EPA's SW846 Method 8082A (Polychlorinated Biphenyls by Gas Chromatography) states "Aroclors are multi­component mixtures. When samples contain more than one Aroclor, a higher level of analyst expertise is required to attain acceptable levels of qualitative and quantitative analysis. The same is true of Arodors that have been subjected to environmental degradation (''weathering") or degradation by treatment technologies. Such weathered multi-component mixtures may have significant differences in peak patterns compared to those of Aroclor standards."

..

Mr. Gala Jackson January 18, 2010 Page 5 of 5

We appreciate the opportunity to provide the above information to EPA for its consideration. Please let me know if you have any additional questions or need any other information related to this topic. As always, I can be reached at 973-722-1656.

Exhibits

cc: Jim McNamara, Georgia EPD Prashant Gupta, Honeywell

Sincerely,

Kirk J. Kessler, P.G. Environmental Planning Specialists, Inc.

,·

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Exhibit 1 Comparisons of Detection Limits to CRQLs and RSLs - OTF Data Set

Notes:

<=10 #of

<lOKAbove

(I) Values are the current EPA Contract Laboratory Program "Medium Soil" Contract Required Quantitation Limits (CRQL). (2) Values are November 2010 Residential RSLs; RSLs for non<arcinogens were adjusted to a HQ of 0 .1. Yellow shaded rows indentify chemicals with fewer than I 0 analytical records in the Sitewide dataset. Red text indentifies chemicals with less than 10% of the detection limits (DLs) exceeding the relevant Medium Soil CRQLs. Blue text identifies chemicals with less than 5% of the DLs exceeding residential RSLs.

1 of 1

Comments

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....- Exhibit 2 Comparisons of Detection Limits to CRQLs and RSls- Quad 1 Data Set

CRQL Residential <=10 <!OKAbowe Medium Soil 111 RSL 111 "of "DL above % Dlabove

(ppm) (ppm) records CRQL CRQL M DL above RSL

I ,2,3-Trichloropropane NA 0.005 10 NA NA 1 ~2,4-Tricblorobcnzene v 0.25 22 45 42 93 ~ ....... l,ln 1\ v l '.1 v L

2.4-Dinilf()phenol v 10 12 42 19 4.S 2,4-Di n ilrotol ucne v 5 1.6 42 v 19 45 2.6-DiniLrotolucne v 5 6.1 42 v 19 45 ' ...;,1 'IM' II<: v 10 6 7.

- 3,3'-Dichlorobenz.idine 5 1.1 42 v 19 45 4-Chloroaniline 5 2.4 42 / 19 45 4,6-DiniLr0-2-mel.bylphenol 10 0.49 42 v 19 45 Aroclor-1016 0.033 0.39 60 48 80 Aroclor-1221 0.033 0.14 60 v 48 80 Aroclor-1232 0.033 0.14 60 v 48 80 Aroclor-1242 0.033 0.22 60 J 48 80 Aroclor-1248 0.033 0.22 60 ./ 48 80 Aroclor- 1254 0.033 0.22 60 45 75 bis(2-Chloroetbyl) ether 5 0.21 42 v 19 45 Hexachlorobenzene 5 0.3 42 v 19 45 Hcxacblorobutadicnc 5 6.2 45 v 19 42 Naphthalene 5 3.6 68 V 19 28 NiLrObcnzcne 5 4.8 42 v 19 45 N-NiLros<Hli-n-propylnminc 5 0.069 42 t/ 19 45 Pentachlorophenol 10 0.89 42 / 19 45 I Pyridine NA 7.8 1 NA NA Thal lium . ) fi 0.51 30 1/' 4 13 Notes: ( I) Values are the current EPA Contract Laboratory Program "Medium Soil" Contract Required Quantitation Limits (CRQL). (2) Values are November 2010 Residential RSLs; RSLs for non-carcinogens were adjusted to a HQ ofO.l. YeUow shaded rows indentify chemicals with fewer than 10 analytical records in the Sitewide dataset. Red text indentifies chemicals with less than I 0% of the detection limits (DLs) exceeding the relevant Medium Soil CRQLs. Blue text identifies chemicals with less than 5% of the DLs exceeding residential RSLs.

1 of 1

7 .t. j,

0 v 17 v 19 v 17

c v 19 v 19

4- z. p'9 v 24 v 24 j,.; 24 t/ 24 V" 24

24

v 42

v 42

v 17 v 19

v 19 t/ 42

v 25 1

v 27

~ % Dlabove

I

RSL Comments

70 /'--'- £5J .)_ j$.'3 J . • _,.,/ -·.

.:l 40.5 "'", """- & S't)

45.2 .GLL .t:.')'!J 40.5 /)~(. ES:J

45.2 lf'-L /5!"/) 45.2 ~- <. !!so

I•J ~2 .CLL- es~ 40 .< P,VL. 40 ...... (. ? - .f> £ 5') 40 ~,;.(... I "( , 40 o ;:.2. -!. est) 40 'o "''- .1) ["))

40 100 .-6Lt ,;- )L)

100 ,CL,(. e ~ 37.8 4L.I- r ;) 27.9 ~.!..(.. .&' S:()

45.2 -<"-" e > .!J 100 ~tL !3. 5'!} 59.5 / . ~_)

100 Less than 10 total records Site-wide 90 ~Lt. {;.•..;

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Exhibit 3

Comparisons of Detection limits to CRQLs and RSLs - Quad 2 Data Set

v v Residential <=10 <lOKAbove E::£~r.~~

RSL Ill #of # Olabove % DL above % DL above (ppm) records CRQL CRQL II DL above RSd RSL

19 0 0 q 0

.l: 19 2. ~ J

0.029 )~1 ss ~ 95 0.39 60 v 35 58 0.14 60 {... 35 58

0.033 0.22 60 v 35 58 r; c 1 1'1 0 )

3 0.03 21 v 21 100 5 0 Jl _g 1 0

0 ')

c -21 -

0

Notes: (1) Values are the current EPA Contract Laboratory Program "Medium Soil" Contract Required Quantitation Limits (CRQL).

(2) Values are November 2010 Residential RSLs; RSLs for non-carcinogens were adjusted to a HQ of 0.1.

Yellow shaded rows indentify chemicals with fewer than 10 analytical records in the Sitewide dataset.

Red text indentifies chemicals with less than 10% of the detection limits (DLs) exceeding the relevant Medium Soil CRQLs.

Blue text identifies chemicals with less than 5% of the DLs exceeding residential RSLs.

1 of 1

Comments

0

Exhibit 4 Comparisons of Detection Limits to CRQls and RSls - Quad 3 Data Set

CRQL Residential <=10 <!OK Above ~ Medium Soi1 111 RSL Ill If Dlabove % Dlabove % Dlabove

(ppm) (ppm) If of records CRQL CRQL If DL above RSL RSL Comments 1, 1,1 ,2-Tetrachloroethane NA 1.9 13 v' NA NA I v 2 15 Aic.- t;;r: 4-o. c 5'l) l, 1 ,2,2-Tetrachloroethane v 0.25 0.56 l· 287 (_./ 52 18 _JL'_ 40 14 ,l l i j-Y._t:;; t /- ' ·~S' 1,1 ,2-Trichloroethane v / 0.25 1.1 v 287 v · 52 18 L/ 25 9 I_~ / ,1

1 ,2-Dihmmoet hmlt' v 0.) 5 0.034 20 v 0 0 v 2 10 1 1. 2 -Dibromo-3 -ch lo nlp ropnn t~ v 0.25 0.0056 20 !, •.. ·· 0 0 v 8 40 1 ,2-Dichloroethane v 0.25 0.45 287 v 52 18 v 40 14 1 ,2-Dichloropropane v 0.25 0.89 287 :/ 52 18 v , 25 9 1 ,2,3-Trichloropropane ~/· NA 0.005 13 NA NA /' 5 38

c:' t:' ) 1,4.4-T, · ge / 0.25 22 74 y 64 86 v 2 3 .<l ~ J-; 5}) 2,4-Dini tropheno1 JL 10 12 64 v' 9 v 14 v' 5 y 8 2.4-Di n i t roto lu ,~ nc v' 5 1.6 64 v 5 8 v 11 17 2 .4,6-Trichlornphcnol / 5 44 64 v 5 8 v 2 3 2 .11--Di nJtn ltl >l ucnc v 5 G.l 64 /5 8 v s 8 3 -- ~Jtro:1n il i nc v 10 61 64 o/ 5 8 v 0 0 ·' .3 '-Ll ich I orobcnzid inc .. 5 1.1 64 JL:. S 8 v 12 19 4-Chl oroan il inc v' 5 2.4 64 / 5 8 t/ 7 11 4,6-Dinitro-2-methylphenol ... 10 0.49 59 v 8 14 .r 1 ,x6 17 Aldrin ' 0.0017 0.029 38 ./ 27 71 v 1 3 alpha-BHC .... 0.0017 0.077 38 v 28 74 v 1 3 Aroclor-1 0 16 v 0.033 0.39 399 v 384 96 v 323 81 Aroclor- 1221 li 0.033 0.14 399 v 387 97 -j')''f ~ 8 :,- A Aroc1or-1232 ·for' 0.033 0.14 399 v 386 97 v 335 84 Aroclor-1242 \_.:· 0.033 0.22 399 v 386 97 v 334 84 Aroclor-1248 !/ 0.033 0.22 399 v 385 96 v 334 84 Benw(blk)fluoranthene ,:'"' 0 fo 0.15 3

., ]'J1( I~ o NA 3 100 -· ])isiJ. -Chlorocl.byl) clhn ...... 5 0.2 1 64 v 5 8 v 53 98 bi ~\? - F.t h vl hexl'll phthalate v 5 35 64 v 5 8 / 2 3

/:' C:J Bromobenzene ;,/ NA 30 13 NA NA 0 0 Bromodichloromethane ~,l 0.25 0.27 287 i/ 52 18 v 48 17 Bromomethane ,/ 0.25 0.73 285 v 51 18 2-4 fi 6' fi Cadmi um ;;;.o;r NA 7 39 NA NA t/ 2 5 Carbon tetrachloride v 0.25 0.61 287 v 51 18 v' 35 12 Chloroform 1,/' 0.25 0.29 287 v 52 18 q.., ~ " 16 Chryse n,· I/ s 15 31 2 v s 3 v 2 1 Cobalt _/ ':;' . u NA 2.3 34 /-< ~ .:Jb' }4'A j./"14 41 llihcnwi <l ,il.l<l llthraculC ~-·· 5 0.015 .3_11

~ - ~9 3 ·/ 298 96

1 of 2 @)

CRQL Residential <==10 <!CM_ Abowe Medium Soil 111 RSL Ill # Dlabove % Dlabove

(ppm) (ppm) #of records CRQL CRQL

Dieldrin v 0.0033 0.03 38 ./ 28 74 Heptachlor cpoxide t/ 0.0017 0.053 38 V' 30 79 [J, ,,.,Lrlul,>IXU'Ill' JL ) 0 I ·• 1/ 5 ~

r h!ll:tchluroout.ldlcnc V' -' h '- 7 v ,. :-.: -Ni troso-<ll·n·pnmvhmu nc v ) u )6~ (4 v II

l'u " l1, ,, -hcrwl t/ 0 ,.) :q 4 I ... ,d D Selemum - - )H( 39 39 ::-)d. 1\ o J(A Telnlchloroetbene lL 0.25 0.55 287 v 52 18 Trichloroethene v 0.25 2.8 287 V 52 18 Vinyl chloride v 0.25 0.06 285 L 52 18 Notes:

(I) Values are the current EPA Contract Laboratory Program "Medium Soil" Contract Required Quantitation Limits (CRQL). (2) Values are November 2010 Residential RSLs; RSLs for non-carcinogens were adjusted to a HQ ofO.l. Yell ow shaded rows indentity chemicals with fewer than 1 0 analytical records in the Sitewide dataset. Red text indentifies chemicals with less than 10% of the detection limits (DLs) exceeding the relevant Medium Soil CRQLs. Blue text identifies chemicals with less than 5% of the DL~ exceeding residential RSLs.

2 of 2

# DL above RSL

1/" 13 v 1

v V" v ,, 1/ ,/ 1 v 40

t/ 8 v 88

Uiiiiii] % DL above

RSL

34 3 lb

7

JJ

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3 14 3

31

Comments

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Exhibit 5

Comparisons of Detection Limits to CRQLs and RSLs - Quad 4 Data Set

-

CRQL Residential <=10 <lOKAboveM r ,

Medium Soil ClJ RSL CZJ II of II DL above % Dlabove I# DL above % Dlabove (ppm) (ppm) records CRQL CRQL RSL RSL Comments

I ,2 -Dibromocthanc !/ 0.25 0.034 25 I 0 0 v 8 32 1. 2-Dihmmo-3-ch lorupropanc v 0.25 0 .0056 25 ;/ 0 0 7 8 32 2,4-Dinitrutuluenc .,/ 5 1.6 26 // 1 4 1/ 1 4 3-Nitroani linc L· 10 61 26 I 0 0 1./ 0 0 v ·

3,3 -Dtch iorobcrmdinc /.-· 5 1.1 26 (./ 1 4 V 2 8 4,6· 1) in it ro-2- llKl hyl phcnul v 10 0.49 23 L- 1 . / 4 13 jl 1o0fi 4,4'-DDT ./ 0.0033 1.7 37 t/19 51 v , 1 3 Aldrin v 0.0017 0.029 37 v 20 54 (../ 2 5 alpha-BHC 1,- 0.0017 0.077 37 v 21 57 v 1 3 Aroclor-1016 L/ 0.033 0.39 364 1./ 333 91 v 259 71

I

Aroclor-1221 v " 0.033 0.14 364 v 333 91 J 1 S 7?3 I t A Aroclor-1232 v 0 .033 0.14 364 / 333 91 ,L.Jo~ 74 Aroclor-1242 v 0.033 0.22 364 v 332 91 v 265 73 Aroclor-1248 (/ 0.033 0.22 364 v 332 91 v 264 73 Aroclor-1262 l,./ 0.033 0.14 17 v 2 12 1/ 1 6 Benzidine t./ 5 0.0005 7 ~,,/ 1 14 v 7 100 Less than 10 total records Site-wide

f Pt_) llellZO(bLk)Jluoraptbene '!: , •) ¢ 0.15 10 -1 ¢ / <). A v ·· 9 90 beta-BHC i/ 0.0017 0.27 37 i/ 22 59 v 1 3 l'lls12-Chkn<•cthyl) ether (/ 5 0. 2.J ?6 £., · 1 3.8 v 26 100

l ~'!) Chlordane o.oon ~ 1.6 1 1 100 1 100 0 / v"'C 2 c ,.. (!//<y _. -~~·-, J Dieldrin L· 0 .0033 0.03 37 / 22 59 vs 14 / Endrin v 0.0033 1.8 37 v 21 57 v 1 3 Heptachlor v 0.0017 0.11 37 / 23 62 v 1 3 Hentachlor epoxide v 0.0017 0.053 37 t.,.. ·· 22 59 t./ 1 3 !-k.xachlonllxnzene '- 5 0.3 26 / 1 4 )/ 2.4 9' ' <.

NitnlbCll/Cnc 1/ 5 4.8 26 ;,- 1 4 / 1 4 N-Nitrosodimethylamine L . NA 0.0023 7 v NA NA v' 7 100 Less than 10 total records Site-wide N--N.ilnJ,o-di-n-propylami ne ,, c

. ) 0.069 26 !-· 1 4 v 26 100 Pentachlorophenol JL 10 0.89 26 v 1 4 v 23 88 Thallium v ),5 p 0.51 35 I ..A / '7 ,,ri v 18 51 ~/

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1 of 2 (~

CRQ.L Residential <=10 ~Above Medium Soil 111 RSllll #of # Dlabove % Dlabove # Dl above

(ppm) (ppm) records CRQ.l CRQ.L

Toxaphene v 0.17 0.44 37 .r 25 68 \ 11! ~·I hluml.- v C' iS 0.06 179 2 Notes:

(I) Values are the current EPA Contract Laboratory Program "Medium Soil" Contract Required Quantitation Limits (CRQL). (2) Values are November 20 lO Residential RSLs; RSLs for non-carcinogens were adjusted to a HQ of 0.1. Yellow shaded rows indentify chemicals with fewer than lO analytical records in the Sitewide dataset. Red text indentifies chemicals with less than 10% of the detection limits (DLs) exceeding the relevant Medium Soil CRQLs. Blue text identifies chemicals with less than 5% of the DLs exceeding residential RSLs.

2 of 2

RSL

v 13

II 1."

-.:: ,.... ....

% DL above RSL Comments

35 ll

(()

CRQL Medium Soil 111

(ppm)

1, 1, 1, 2-Tetrachloroethane NA 1,1 , 2,2-Tetrachloroethane 0.2.5 1, 1, 2 -Tricrdoroethane 0.25 1,2 Dib romoethane 0.25 1,2 Dibromo 3 chl oropropane 0.25 1,2· Dichloroeth<Jne 0.25 1, 2 -Dich loropropane 0.25 1,2,3-Trichloropropane NA 1,2,4-Trichlorobenzene 0.25 2 N1troan iline 10 2,4-Dinitrophenol 10 2,4-Dinitrotoluene 5 2,4,6-Trichlorophenol 5 2,6-Dinitrotoluene 5 3-Nitroani line 10 3,3'-Dichlorobenzidine 5 4-Chloroaniline 5 4,4'-DDT 0.0033 4,6-Dinitro-2-methylphenol 10 Aldrin 0.0017 alpha-BHC 0.0017 Aroclor-1016 0.033 Aroclor-1221 0.033 Aroclor-1232 0.033 Aroclor-1242 0.033 Aroclor-1248 0.033 Aroclor-1254 0.033 Aroclor-1260 0.033 Aroclor-1262 0.033 Aroclor-1268 0.033 Benzidine 5 Benzo(b/k)fluoranthene NA beta-BH C 0.0017 bis(2-Chloroethyl) ether 5 bis( 2-Ethylhexyl) phthalate 5 Bromo benzene NA

Exhibit 6 Comparisons of Detection Limits to CRQLs and RSLs - Site Wide Data Set

Residential <=10 <lOKAbcM RSL 121 I# DL above % DL above If DL above (ppm) #of records CRQL CRQL RSL

2 45i NA NA 2 0.59 585 55 9 42

1.1 S85 55 9 2.7 0.034 so 0 0 10

0.0056 50 0 0 16 045 585 ss g 42 0.89 585 55 9 27

0.005 51 NA NA 21 22 194 154 79 2

NA 154 6 4 NA 12 154 29 19 23

1.6 154 25 16 31 44 154 25 16 2

6.1 154 25 16 23 61 154 6 4 0

1.1 154 25 16 33 2.4 154 25 16 27 1.7 125 87 70 1

0.49 146 28 19 31 0.029 125 93 74 4 0.077 125 95 76 2

0.39 910 827 91 643 0.17 910 830 91 672 0.17 910 829 91 667 0.22 910 828 91 661 0.22 910 827 91 660 0.22 910 790 87 659 0.22 910 811 89 658 0.14 30 3 10 2 0.22 860 744 87 655

0.0005 7 0 0 7 0.15 72 NA NA 56 0.27 125 97 78 1 0.21 154 25 16 153

35 154 25 16 2 30 51 NA NA 0

1 of 2

., .... % DL above

RSL

4

7

s 20 32

7

5

41

1

NA 15

20

1

15

0 21

18

1

21

3

2

71

74

73

73

73

72

72

7

76

100 78

1

99

1

0

Comments

Less than 10 total records Site-wide

(£)\ ~).

-

CRQ,L Residential <=10 <!OK Above Medium Soi1 111 RSL Ill # DL above % DLabove # DL above

(ppm) (ppm) # of records CRQL CRO.L ll"n: Jli 0 m1 :11.1 L 1 8 ~ > '

131<Jrl• nlt11, •JOe 0. ·~ I 1 ~ J, Cadmium 0 .} AA 7 130 NA NA 't ' hlortde " ) ~ u ol , ... ~

Chlordane ' lg I u Chloroform 1) ' ' 5 '

• 1<. <, ' ) I

Cobalt ltv JJ~ 2.3 122 NA NA )ib 'n lO( J )ilnthr,,cnnr> " [ [IQ ] 'HI ~

Dieldrin 0.0033 0.03 125 97 78 Endrln 0.0033 1.8 125 96 77 Heptachlor 0.0017 0.11 125 96 77 Heptachlor epoxlde 0.0017 0.053 125 99 79 Hexachlorobenzene 5 0.3 154 25 16 Hexachlorobutadiene 5 6.2 184 25 14 In Jl 1 'j IJ' 'I ') J.b ,. 9 , , I• 1phtr1 n ' & !i ,

1 Nitrobenzene 5 4.8 154 25 16 N-Nitrosodimethylamlne NA 0.0023 7 NA NA N-Nitroso-di-n-propylamine 5 0.069 154 25 16 Pentachlorophenol 10 0.89 154 30 19 Pyridine NA 7.8 1 NA NA Selenium ~ ) .)($. 39 130 NA NA lt '' morot th• 11 ..... ( <.S .,.,5 )

T I IIIII -1 • ..l /< I i Toxaphene 0.17 0.44 125 lOS 84 r r~ct ' ,, ':>t rtl·ne ( :> ). :>

'v 1\ I<Jr d·~ I Ob ~ .l - L__ __ _

- ~-----

Notes: (1 ) Values are the current EPA Contract Laboratory Program "Medium Soil" Contract Required Quantitation Limits (CRQL). (2) Values are November 20 10 Residential RSLs; RSLs for non-carcinogens were adjusted to a HQ ofO.I. Yellow shaded rows indentify chemicals with fewer than 10 analytical records in the Sitewide dataset. Red text indentifies chemicals with less than I 0% of the detection limits (DLs) exceeding the relevant Medium Soil CRQLs. Blue text identifies chemicals with less than 5% of the DLs exceeding residential RSLs.

2 of 2

RSL

J , 2

1/

21 ;qo

19

1 1

2

151

23 . .,. sl

25

7

154

128

1

1 1

30

'

. .._

.-......... % DL above

RSL Comments

J I 1:

2

17 <)).

15

1

1

2

98

13

16

100 Less than 10 total records Site-wide

100

83

100 Less than 10 total records Site-wide

1

24

1

(/(? ) '"""'"'""..,../

Exhibit 7

GIS Figures for "Black Font" Chemicals